Cassette Toilet vs Conventional RV Toilet

Hi Y'all, RE smells: Our big TC has a regular toilet. And our small TC has a Porti-Potty (the electric flush one). From time to time, they have both had an odor. I've tried the orange stuff, and the green stuff, and the formeldahyde, and I didn't like any of them because they had their own smell. What works for me is baking soda. Sucks up odors like a sponge. And won't harm anything. And NO odors. I buy a 5 pound bag at Costco or Sam's and dump some into the holding tanks whenever I detect an odor. I dump in about a cup at a time and repeat if necessary.